Inclined grate for automatic stoking.



No. 702,538. [Patented June l7, l902'.-

(Application filed July 6, 1896.)

(No Model.)

| 1' I" I ATTFST nmllllllllhu INYENTDR 1 and experience with this particular stoker or UNITED STATES PATENT OFFICE.

HENRY H. CAMPBELL, OF CLEVELAND, OHIO.

INCLILNED GRATE'FOR AUTOMATIC STQKING.

I SPECIFICATION forming part Of Letters Patent N0. 702,538, dated une 1'7, 1902.

Application filed July 6,1896. $erial No. 598,113. (No model.)

To all whom it may concern:

Be it known that I, HENRY H. CAMPBELL, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Inclined Grates for Automatic Stoking; and I do hereby declare thatthe followingis a'full, clear, and exact descrip-. tion of theinvention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to inclined grates for automatic stoking, and the invention is an improvement in a style of grate known now as The Brightman and first disclosed in United States Patent No. 318,862, May 26, 1885, and subsequently improved byH. H. Campbell and patented September 26, 1893, No. 505,748. The present improvement is supplemental to the said Campbell patent,: and embodies an improvement which time grate have shown to "be necessary. in order that satisfactory results may be obtained.

The particular defect remedied by the present invention is the defective feed which was encountered over the longitudinal bars which support the fuel-carrying shelves; and the invention therefore consists in a stoker, having a feed-grate constructed and operating substantially as shown and described, and particularly pointed out in the claim.

In the accompanying drawings, Figure l'is' a vertical sectional elevation of a grate embodying my'invention; and Fig. 2,is a perspective view of a portion of thesaid grate, as hereinafter more fully described."

A represents the inclined side pieces orbars constituting the stationary portions of the said grate and having lateral and horizontally-disposed shelves 2 integral therewith, and B represents the corresponding side pieces or bars of the reciprocating portion of the grate and having shelves 3 integral therewith at their sides. These bars A and B, with their shelves 2 and 3, are supported as heretofore or in an equivalent way, the means of support not forming a part of this invention. It will be noticed that the bars A and B are arranged in pairs side by side, while their shelves 2 and 3 project from opposite sides, but on the same plane in each set-that is,

the shelves 2 of the bars A are on the same plane all theway across the furnace, and the shelves 3 in their series extend all the way across the furnace also; but the said shelves alternate from'top to bottom of the grate,

there being first, say, aseries of the shelves or steps 3 and then a'series of shelves 2, and

so on successively. It will be further noticed point of departure in this invention from that. which-has gone before and is disclosed in the patents above mentioned. Thus in said patents the shelves corresponding to 2 and 3 in this case were located so as to bring their front edge fiushwith the inclined top or front edge, (indicatedb y 4: in these drawings.) This served a fairly'good purpose; but in time I discovered that the construction was defective, because there was-nothing to break up the coal, which baked and packed immediately over and upon'thesaid edges 4 of the bars A and B. Theconsequence was that Iwhilethe reciprocation'of gratemember's B was sufficient for allpurposes, so far as the space between the several grate-bars A and B was concerned, it was wholly inadequate and deficient so far as the space over said bars was concerned. Hence, I found it "necessary to'remedy this defect and have done so by constructingthe' shelves 2 and 3 as shown. In this construction it will be seen that the said shelves all project a considerable distance out beyondthe said edges 4: as seen at 5 and 6, respectively, and this'works-thedesired remedy. Thus at 5 on each of the bars A and at 6 on each of the bars B the said shelves are built out over their bars, as shown, thus throwing a shoulder or projection across the otherwise plain edge of said bars, while at the opposite edges the said shelves project out at the immediate sides of the bars A and B and serve to break up the coal at those points which come between the shoulders 5 or o, as the case may be. Both shelves 2 and 3 have these advanced edges alike, and their eltect is substantially the same in each case when the grate is operated to move the coal.

The grate-bars B are supported at their lower ends on the rocker S and at their upper ends on the standard 9 and have a substantiallyhorizontal movementthatis,the movement is inward and outward in about ahorizontal plane, so far as the shelves 8 are concerned. This moves every alternate shelf and leaves the other alternate shelves 2 standing in stationary position. In that case the corners 7 of shelves 3 serve to break up the coal in the edges of bar A, While the corners 7 of the shelves 2 serve to break up the coal along the edge of bars B. Furtlilermore, as the coal works down over the edges 4 of the bars A and B it must ride over the projections 5 and 6, which will help to break it up and open it up to draft from between and about said bars.

WVhat I claim as new, and desire to secure by Letters Patent, is-

In furnace-grates, a set of fixed grate-bars A arranged in pairs and a set of movable grate-bars l3 arranged in pairs and alternating- With the said fixed bars, both said bars A and 15 having horizontal shelves which extend laterally to the next adjoining bar on each side, the shelves of the movable bars interlocking with those of the fixed bars, and the shelves of all the bars extending out beyond the upper surface of the bars and forming projections thereon, all the bars being supported in an inclined position, and means to impart movement to the movable bars in a substantially horizontal direction, substantially as described.

\Vitness my hand to the foregoing specification on this 3d day of June, 1896.

HENRY H. CAMPBELL.

\Vitnesses:

H. T. FISHER, II. E. MUDRA. 

